N scale defect detector

Model Railroader Prototype information for the modeler
1

Hello! I was wondering if anyone knows about a defect detector for n scale. Thanks!

Nathaniel Nagel https://www.youtube.com/channel/UCJ9BLPXTEpi785ppPX7yLuQ

2

I found this in the walther’s website but it’s HO

You could easily scratchbuild it.